User Manual

Model No. ＧVC-＊＊VERNIER CALIPERS (Mono・Block)
PRECISION MEASURING TOOLS

Thank you for purchasing the Vernier Calipers (Mono・Block).
This product is a precision measurement tool with a main scale and a vernier scale to indicate the measured value.
●For safe and proper use of this product, please read this instruction manual before use and follow the procedures described. Pleasekeep manual where it is accessible to user for future reference.
●Keep this manual with the instrument if transferred or leased to a third party.
●For inquiries about this product, please contact dealer or Niigata Seiki at the address listed on the following page.

■PART IDENTIFICATION AND FUNCTION⑤Measuring surfaces for internal measurements⑥Lock Screw④Inside Jaws
③Measuring surfaces forstep measurements

010200103020304050405060

7080906007080⑦Main Scale

90100110120130140150 mm

0.05mm⑩Thumb Knob
②Outside Jaws

⑧Depth Bar⑪Vernier Slide (Vernier Scale)⑨Measuring surfaces for
depth measurements①Measuring surfaces for external measurements①Measuring Surfaces for outside measurements … Object to be measured is positioned between these surfaces.
②Outside Jaws ………………………………………… Measures extremal dimensions. Move Slide to open and close.
③Measuring surfaces for step measurements …… Measures the height of steps.
④Inside Jaws…………………………………………… Measures internal dimensions. Move Slide to open and close.
⑤Measuring surfaces for internal measurements … Position surfaces inside object to be measured.
⑥Lock Screw …………………………………………… Locks the Vernier Slide position.
⑦Main Scale …………………………………………… Indicates measured value in 1mm graduations.
⑧Depth Bar …………………………………………… Bar for measuring depth. Bar moves in and out with Vernier Slide.
⑨Measuring surfaces for depth measurements …… Depth is measured between these two surfaces.
⑩Thumb Knob ………………………………………… Position thumb on knob for precise control of vernier slide.
⑪Vernier Slide (Vernier Scale) ……………………… Scale for measuring with a resolution of 0.05mm.
Refer to following page for usage instructions.

SAFETY PRECAUTIONS
Always follow the proper operating procedures in order to prevent
harm to yourself or others, and to prevent damage to property.

WARNING

Please Observe
Denotes a prohibition You MUST NOT do

Denotes a requirement You MUST do

Indicates risk of personal injury or property damage if not followed.

Read the manual and follow the directions.
・Use of product other than as described in the manual
may cause accident.
Use only for measuring.
・Use for any purpose other than measuring may
damage or wear the instrument. Improper use may
also cause accident.
Handle with Care.
・Do not drop or subject instrument to excessive shock.
Do not place under heavy objects. Improper handling
may cause damage or poor accuracy.
・Do not scratch instrument, for example by writing ID
number.

Use In Proper Environment.
・Please do not use instrument in rain or locations withexcessive humidity. Do not use at extreme high or low
temperatures. Keep out of direct sunlight.
Jaw Tips Are Sharp̶Handle With Care.
・Careless handling may cause injury.
Do not move the Vernier Slide when the Lock Screwis tightened.
・Excessive force applied to Slide may cause damage oraffect accuracy.
Do not disassemble or modify.
・Do not remove the vernier slide, Please do not attempt todisassemble or modify as it may cause damage or poor accuracy.

CALIBRATION●In order to maintain instrument accuracy, it is recommended that
accuracy is confirmed through calibration on a periodic basis.
Wear of measuring surfaces from repeated use may affect accuracy and periodic
accuracy checks should be performed.

We provide calibration services.
Please contact agent in country ofpurchase to make arrangements.

PREPARATION FOR USE
Before using the caliper, follow the steps below:●Loosen the lock screw.

Moving the vernier slide with the lock screw tightened may cause excessive force to the slide which will damage the caliper and affectaccuracy.

●Wipe off any corrosion, dirt, or oil from measuring surfaces and slide.
Contamination of surfaces may cause measurement error.

●Allow the caliper and object to be measured time to reach the same temperature.

A temperature difference between the object to be measured and the caliper may cause measurement error. Allow enough time for thetemperatures to equilibrate.

●Performing an accuracy check.

①Jaw AlignmentIn closed position, make sure the measuring surfaces on the outside
jaws align properly and there is no gap (no light should leak past.)

0②Confirm “0” points on scale (see diagram at right)
With jaws closed as in step ① above, make sure the reading is zero andthe vernier scale graduations align at the “0” and “39” positions as shown.

010102030

204050306070③Depth Confirmation
Position caliper on a flat surface for depth measurement. Reading shouldbe “0” as in step ② above, with the verier graduations aligned at the “0”and “39” positions.

504080900.05mm

0Proper alignment

READING THE SCALEPREVENTING ERRORSThe measured value is determined by reading the main scale,and then adding the Vernier Scale reading as determined by
the position where the vernier and main scale graduations align.

In order to prevent measurement error, please note the following.

Measured Value = Main Scale Reading + Vernier Scale Reading＜Flat surfaces＞●EXAMPLE 1
Main Scale（1㎜）
Vernier Scale（0.05㎜）70

Measured Value: 77.00mm
80010●EXAMPLE 2
Main Scale（1㎜）
Vernier Scale（0.05㎜）7070405060701010090

2080

901200.05mm

0Reading
77＋ 0 .0 077 .0 0304050601107080901200.05mm

010100902030405060110

7080

90

Reading77＋ 0 .3 077 .3 0120

00.05mm

Reading77＋ 0 .3 577 .3 5

AFTER USE CARE, STORAGE NOTES●As required, wipe slide and measuring surfaces with a dry
cloth treated with anti-corrosive oil. When not in use, apply
anti-corrosive treatment or keep in anti-corrosive bag.
●When not in use, keep jaws slightly open and lock screwslightly loose to prevent over tightening due to thermal
expansion which may affect accuracy.
●Store in supplied case in a cool, dry location.

Jaw

When measuring featureswith flat surfaces, make surethe measuring surface of thejaws are parallel to thesurfaces to be measured.

＜Cylindrical surfaces＞

When measuring cylindricalfeatures, make sure thecaliper jaws are perpendicular
to the cylinder axis as shown.

Measured Value: 77.35mm
80030110

Measured Value: 77.30mm●EXAMPLE 3
Main Scale（1㎜）
Vernier Scale（0.05㎜）2080

010090POSITIONING CALIPER ON OBJECT

Object being measured

VIEWING THE SCALE0Scale should be read fromdirectly above the calipers.
Due to step in height of vernierscale relative to main scale, ifviewing direction is not directly
above the reading may haveparallax error.

102001030

2030

40

50

4050

60

70

80

90

60070

80

90

1001101200.05mm

SPECIFICATIONS●Material : Stainless Steel
Model No.

GVC-10GVC-15

GVC-20GVC-30Measuring Range 0〜100mm 0〜150mm 0〜200mm 0〜300mm
Resolution
Accuracy

0.05mm±0.05mm±0.08mm

Niigata seiki Co., Ltd.
6-15-22, Tsukanome, Sanjo, Niigata, Japan, 955-0055
Tel. : +81-256-31-5660 Fax. : +81-256-39-7730

MAIL:intl.sales@niigataseiki.co.jp
URL http://www.niigataseiki.co.jp

I259-K1510